Soundscapes

I ripped out the c++ soundscape system and re-wrote it in game code. So good news, you don't have to edit text files to make soundscapes any more!

From the mapper's perspective the soundscapes work the same. Make the entity and select the soundscape. The only difference is that soundscapes are assets - so you get to pick the soundscape from a list instead of typing a name in there.

There's also a debug overlay so you can see what's playing and when the stings will next play.